Bio-drying is an important treatment for the reduction of urban organic waste. However, due to the long processing cycle、low dehydration efficiency and unstable operating temperature of traditional bio-drying, It is difficult to adapt to the huge amount of food waste disposal needs after garbage classification. in this study, food waste and sawdust are used as raw materials. Based on different thermal assist strategies such as following thermal assist(T1)、continuous 50°C thermal assist(T2), and stage 50°C thermal assist(T3) to study the influence of different thermal assist strategies on the moisture content (MC), seed germination rate (GI), volatile solids (VS), quality loss, energy consumption, and other indicators of the bio-drying process of food waste. The results show that the thermal assist strategies can significantly affect the bio-drying efficiency. The temperature integration indexes of the three groups of thermal assist treatment (T1, T2, T3) are respectively: 639.8℃, 632.9℃ and 621.8℃, which are 42.15%, 40.61% and 38.15% relative higher than the control group (T-CK); moisture removal rates were 78.42%, 80.33%, and 77.86%, which were 51.27%, 54.96%, and 50.19% relative higher than the control group (No external heating source). Following thermal assist treatment helps to maintain the high temperature of the pile、reduce the weight of the material and the product decomposes, and has low energy consumption, which is suitable for the subsequent utilization of composting resources; the continuous thermal assist treatment has the highest water removal rate、unit organic matter degradation and dehydration capacity, and the lowest organic matter degradation rate、total carbon and total nitrogen loss rate, which is helpful for dewatering the material, but the energy consumption is higher and after 15 d bio-drying pile does not up to the maturity standard, which is suitable for subsequent incineration treatment.
范鑫祺,陈睿,李琬婷,等. 不同辅热策略对餐厨垃圾快速生物干化的影响[J]. 科学技术与工程, 2021, 21(36): 15688-15694.
Fan Xinqi, Chen Rui, Li Wanting, et al. The Influence Of Different Thermal Assist Strategies On The Rapid Bio-Drying Of Food Waste[J]. Science Technology and Engineering,2021,21(36):15688-15694.